Dissociative electron attachment to CO and NO: the O− production threshold revisited

Denifl, G.; Muigg, D.; Stamatovic, A.; Märk, T. D.

doi:10.1016/s0009-2614(98)00263-2

Cited by 35 publications

(21 citation statements)

References 15 publications

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“…Our results show that the dissociative attachment cross sections in this channel that originate from the ground vibrational state of NO are extremely small, as confirmed by several experimental studies [17][18][19][20]. However, the dissociative attachment cross section is predicted by these calculations to increase by several orders of magnitude when the dissociation takes place from vibrational excited states of NO.…”

Section: Discussionsupporting

confidence: 85%

“…Orient and Chutjian [16] claimed to have measured ground state fragments of reaction channel e + NO → O − ( 2 P) + N( 4 S), reporting it as the most abundant channel in the DA to NO. However, several studies performed afterward [17][18][19][20] found no indication of the occurrence of ground-state fragments in their measurements, consistently reporting (2) as the major DA channel, with reaction channel (3) making a smaller contribution. Our calculations show that, although cross sections that proceed through reaction channel (1) are negligibly small when DA proceeds from the vibrational ground state of NO, significantly enhanced cross sections are obtained when the target is vibrationally excited.…”

Section: Introductionmentioning

confidence: 93%

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Nonlocal model of dissociative electron attachment and vibrational excitation of NO

et al. 2005

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We present the results of an ab initio study of elastic scattering and vibrational excitation of NO by electron impact in the low-energy (0-2 eV) region where the cross sections are dominated by resonance contributions. The 3 Σ − , 1 ∆ and 1 Σ + NO − resonance lifetimes are taken from our earlier study [Phys. Rev. A 69, 062711 (2004)], but the resonance energies used here are obtained from new configuration-interaction studies. Here we employ a more elaborate nonlocal treatment of the nuclear dynamics, which is found to remedy the principal deficiences of the local complex potential model we employed in our earlier study, and gives cross sections in better agreement with the most recent experiments. We also present cross sections for dissociative electron attachment to NO leading to ground state products, O − ( 2 P) + N( 4 S). The calculations show that, while the peak cross sections starting from NO in its ground vibrational state are very small (∼ 10 −20 cm 2 ), the cross sections are extremely sensitive to vibrational excitation of the target and should be readily observable for target NO molecules excited to ν = 10 and above.

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Section: Discussionsupporting

confidence: 85%

Section: Introductionmentioning

confidence: 93%

Nonlocal model of dissociative electron attachment and vibrational excitation of NO

et al. 2005

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“…The asymmetric peak shape of the (G-H) -ion with a steep onset indicates that the dissociation limit is within the energy range governed by the Franck-Condon transition. Theoretically one should obtain a true vertical onset and the deviation from this expected behavior is the result of the finite electron-energy resolution [34]. In the current case the first derivative of the (G-H) -cross-section leads to an effective electron-energy resolution of 110 meV.…”

Section: Methodsmentioning

confidence: 74%

Dissociative electron attachment to gas-phase glycine

Ptasińska

Denifl

Abedi

et al. 2003

Analytical and Bioanalytical Chemistry

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By using a high-resolution electron energy monochromator low-energy electron attachment to gas-phase glycine (H2NCH2COOH, or G) has been studied by means of mass spectrometric detection of the product anions. In the same way as for several other biologically relevant molecules no stable parent anion was formed by free electron attachment. The largest dissociative electron attachment (DEA) cross-section, approximately 5x10(-20) m2, was observed for (G-H)-+H at an electron energy of 1.25 eV. Glycine and formic acid (HCOOH) have several common features, because a precursor ion can be characterized by electron attachment to the unoccupied pi* orbital of the -COOH group. At higher incident electron energies several smaller fragment anions are formed. Except for H-, which could not be observed in this study, there was good agreement with an earlier investigation by Gohlke et al.

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“…The present experiment thus excludes, within the limits given above, the idea that channels (1) and (3) are active, at least in the absence of a strong magnetic field in the collision region. The hypothesis that these channels were missed in the earlier studies [7,11,12] because of limited angular range of observation or because of ion kinetic energy discrimination due to problems with ion draw-out field is not justified.…”

Section: Resultsmentioning

confidence: 99%

Decay channels in the dissociative electron attachment to NO

Allan

2004

J. Phys. B: At. Mol. Opt. Phys.

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Kinetic energy spectra of O − from dissociative electron attachment (DEA) to NO were measured at 7.6, 8.0, 9.0 and 10.0 eV electron energy using a spectrometer with hemispherical energy selectors for both the incident electrons and the resulting ions. The measurements were performed at 10• , 30• , 90• and 135• . The capacity of the spectrometer to detect both slow and fast ions was verified and the spectra were corrected for the analyser response function. Under these conditions only a signal corresponding to O − in the ground state and N in the first excited state was observed, a signal from the remaining two energetically accessible channels was absent. These observations confirm the original conclusion of Chantry (1968 Phys. Rev. 172 125) and reduce the range of possible explanations for the diametrically different observations of Orient and Chutjian (1995 Phys. Rev. Lett. 74 5017).

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Dissociative electron attachment to CO and NO: the O− production threshold revisited

Cited by 35 publications

References 15 publications

Nonlocal model of dissociative electron attachment and vibrational excitation of NO

Nonlocal model of dissociative electron attachment and vibrational excitation of NO

Dissociative electron attachment to gas-phase glycine

Decay channels in the dissociative electron attachment to NO

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